Remote control system for transmitting commands in mines - has one loop with transmitters and others with relays for use in confined space

摘要

The remote control system, for transmitting commands to equipment in mines, consists of one or more loops with a max. of 24 transmitters and a corresponding number of receivers, together with the appropriate couplers. Where a number of loops are used only one loop is provided with transmitters for transmitting commands. The remaining loops have relays instead of transmitters. The advantage lies in the smallness and cheapness of the relays compared to transmitters. The remote control system can therefore be expanded without great cost.